Doweling jig



SSP 12 i950 B.' L. POLKOSNIK ZZZ@ nowELING .11G

.Filed Nov. l5, 1949 2 Sheets-Sheet l Sept, l2, 1950 E. L. POLKOSNIK lDOWELING JIG 2 sheets-sheet 2 Filed Nov. l5, 1949 WA @n Patented sept. 12, 195o it vnownLI l' 'er'nard '.Po1kosnik,`ridgeiorti, Conn., assignor to General Hardware Mfg'.l CoJnc., New York,

` N.' Y., acorporationof NeWXQifk': i' 4' I, Application November 1 I,'Ihe,presentV invention* relates to dowelling jigs. im'

used in carpentry and kindred arts and trades, and more particularly to jigs which clamp 'onto the work. Although primarilyintendedhfor Woodf-l working, these `tools are adaptablel for workin metal, plastic, stonel andvarious 'other materials... ,-I-Ieretofore, -jigs of this, class weremade .forka single size drill each, or elsey for they drillingoi'` diiherent sized holes by includinga plurality `:of separate nested slip bushings, in which instance, to .vdrmilllav holeoi a size of one ofthe bushingsA alLof ysmaller size were removed. Many times, such,bushingsv removed from the jig properwere lost.l

, ,Itis therefore one of the objects of the present invention, to provide a novel andimproved dowelling .jig of the character mentioned,z Which aff. fords .provisionfor the drilling of holes` of ,vari-z ous 'sizes, Vand yet has no separable parts at all, but in composite is a unitarystructure.,v l o A Another object. hereof `is to provide,l a-jig-of. thetype described,` of novel andimproved-fcone. struction, which precisely holds the requiredsize bushing ,at true. drill position, becauser ofl novel, functionaly relationship of jig components,... .A further object hereof is to provide a novel and improved dowelling jig of the class set forth, which is reasonably cheap to manufacture, easy1 to-use, accurate in performance, and eiilcientdn carrying out the purposes for which it is designed.

Other objects and advantages will become apparent as this 'disclosure proceeds. I

In the accompanying drawings forming par of this specification, similar characters of referf ence indicate corresponding parts in all the views. Fig. 1 is a perspective view of ay dcwelling jig embodying the teachings of, this invention.

. Fig. 2 is a section taken at lines 2--2 in Fig. 1, showing thejig in use. l l. Fig. 3 repeats part of the sectional View shown in Fig. 2, namely that `of the bushing turret included in this device.

Fig. 4 is a bottom view of Fig. 3.

Fig. 5 is a perspective view of the turret carriage included in this jig embodiment of Fig. 1.

Fig. 6 is a section taken at lines 6-6 of Fig. 1.

Fig. '1 shows how a piece of work is marked with lines through centers of the holes to be drilled, before mounting it in the jig.

In the drawings, the numeral I5 designates the handled screw of what is really a C-clamp having a longitudinal opening along its back. Such C-clamp is comprised in the embodiment illustrated, of a screw-supporting arm I6, held spaced from the clamping block I1, by the spaced rods 5, 194e," serial Noriz'znoo 'n 'z claims.' (ernia-e2) l 1 lm8,-along which thelcarriage I9 is slidably carried for-movement between the end members I6 and I1. outwardly of the back of the saidy clamp structure, said carriage I9 supports a tur-` ret member2 rotatably on a stud 2 I` which extendsxedly fromsaid carriage.

Said stud is ofreducedsize at 22, within the turret member 20,.,aifordingl an annular groove for the, stud-y engaging end of, the set-screw 23, radially-:po:

V. sitioned inand threadedlyengaged in said turret member 2,0.; The clamping end of the screw o lipreferably. s wivellycarries the head 24,.` Ihe postor dotherwork 2li` to vbe drilled to provide a I d owel socket, is` clamped by said screw l5 lagainst the block I1. Fixing of the position of ,i ijhecarriagel 9 is formed wlth a central sunken iioor28,commencing at the Aedge 29 whichis nearest the block I1. A little inward of,.this edge, ,there.y is a hole 30 through this f loorfin which Ithe stud 2I is mounted securely. .In use,

'thefturret bottom rests on the seats 3| which maybefintegralfwith the floor 28. o v The turret .memberill which is a cylindrical block, has drilled therethrough a pluralityof differentfs'ized," equi-spaced holes, denoted respectively byv the numerals 32` through 31.` All thesel holes'arevpara-llel to the axial pin or stud 2I,^and"the"locus offtheir centers isa circleof radius 1R -f The turret block thus provides'fdrill bushings of predetermined sizes which'may be marked thereon at appropriate positions onv the exposedface thereof. All these holes are aside thecarriage oor 28. The line of movementfof the carriage I9 isperpendicular to the faceJI1J of the clamping block I1.

On said floor 28 of the carriage, is a boss or pad 38 of a diameter equal to or slightly larger than the largest of the bushing holes 32 through 31 in the turret 20. At the bottom of said turret, all of said holes having a diameter less than that of the boss 38, are countersunk shallow. The diameter of the countersinkings shall be in good sliding fit with the locating boss 33, which is of sufcient height to enter the counter-sinks denoted respectively by the numerals 32 to 36'; hole 31 being just-,right to admit said boss slide t thereinto. When said boss 33 is within one of the bushing holes or their countersunk portions respectively, the bushing hole clear of the floor the heightv of. the bossy 38 exceedstheh'eight ofv the seats 3I, so that said boss may' enter the4 countersunk holes and the bushing hole intended to admit it. The set screw 23 need be witl'ldrawn` from the axis hole 3S of the turret member; 2U

and the turret lifted to shift the turretl to its different positions. i

If bushing hole at is the one 'to be at drm pesition, the turret member 20 is set so that boss 38 is Within countersunk 33', and set screw 23 is then tightened. Said turret member 2D is thus xed against axial rotation and against Inovement longitudinally of the pin 2l and the drill 42. TheA carriage member I9 is so dimensioned that the axis line of the bushing hole at drill position, is in th-e plane determined by ther faces 43 and 44, which' plane is perpendicular to the line of movement of the said carriage. Thus said faces 43 and i4 determine the truel position of one of the center lines of the hole to be drilled, and marking 49 determines an intersecting center'line for such first determinedline.

Therefore the work 25 to be drilled, is rst marked with the perpendicular lines 45 a-nd 4G? determining center at point Pof one ofthe holes to be drilled in said work, and likewise for other points as P', by marking on suchA work the lines 41 and 48.

To position the work 25 in the jig for the drilling of a hole at point P, line 45 is brought to marking all, the carriage I9 is brought so that line 45 is in the plane of the faces 43y and-114, and then the work is clamped against the block I'I by means of the screw I5. With the jig so setA on the work, the drill 42 is applied through the bushing hole at what is herein termed drill position. l

Thegraduations shown on rod I8 indicate the distance from the face Il to the center linev of drill position, and the carriage AI9 may carry an arrow symbol pointing to such graduation which is in the plane of the face 03.

This invention is capable of numerous forms and various applications without departing from the essential features herein disclos-ed. It is therefore intended anddesired that the embodiment shown herein shall be deemed illustrative andnot restrictive and that the patent shall cover all patentable novelty herein set forth; reference being had to the-following claims rather than-t the specic description herein to indicate the'scope of this invention.

I claim:

1. In a dowelling jig of the character described, the combination of a clamping means adapted to hold an object to be drilled, a carriage slidably mounted on said clamping means, means to releasably secure the carriage at any position along its scope of movement, a turret member rotatatably carried on the carriage and slidably mounted along its axis of rotation; said turret member presenting a plurality of differently sized holes 'Whose axes are parallel to and equi-spaced from itsaxis of rotation; said holes at la corresponding end of each of them, being identically dimensioned and a turret-positioning element extendving from theV carriage; said element being of a 'shape' engageable in said identically dimensioned hole ends respectively, adapted to be engageably set selectively in one of said identical hole ends at a time, upon movement of the turret member along and about its axis of rotation, whereby the turret member-is held against rotation on the carriage andA whereupon one of the holes is in position to have a drill passed therethrough and into the object clamped.

' 2. In a dowelling jig of the character described,

the combination of a clamping means adaptedtov hold an object to be drilled, a carriage slidably mounted on said clamping means, means to releasably secure the carriage at any position along its scope of movement, a turret member rotatably carried on the carriage and slidably mounted along its axis of rotation; said turret member presenting a plurality of differently sized holes whose `axes are parallel to and equi-spaced from its axis ofrotation; all except the largest of said holes being countersunk at one of their respective ends; the size of said countersunks being that ofthe largest of said holes and aturret-positioningA element extending from the carriage; said element being of a shape enga-geable in said identically dimensioned hole ends respectively,`

Thefollowing references are of record in the rile of this patent:

UNITED STATES PATENTS Number Name Date 809,069 Lovett Jan. 2, 1906 891,606 Doldt et al June 23, 1908 2,050,709 i Lopez Aug. 11,1936 

